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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 
        h1{
            background-color: blanchedalmond;
        }
        div{
            background-color: blanchedalmond;
        }
        p{
            background-color: blanchedalmond;
        } 
        */
        /* 群组选择器 ,以逗号相隔*/
        /* 
        h1,div,p{
            background-color: blanchedalmond;
        } 
        */
        h1,
        .ff,
        p {
            background-color: blueviolet;
        }
    </style>
</head>

<body>
    <h1>234444444</h1>
    <div class="ff">234234</div>
    <p>erwer</p>


</body>

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